In-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and preparation method thereof

A nanoparticle and high-entropy alloy technology, applied in the field of metal processing, can solve problems such as uneven temperature distribution, improve powder consolidation, and small product size, so as to avoid volatilization and segregation, improve material strength, and refine grains. Effect

Active Publication Date: 2020-08-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing particle-strengthened high-entropy alloys are prepared by high-energy ball milling and spark plasma sintering. Although this process can effectively introduce particles, it can also use refined grains to further improve the material. Strength, but spark plasma sintering equipment, its price is more expensive, and the size of the prepared product is still small
Moreover, limited by the existing mold materials, the pressure that can be applied during the sintering process is usually only tens of MPa, which is not conducive to improving the consolidation of the powder
In addition, during the spark plasma sintering process, there are relatively uneven temperature distributions on the macroscopic and microscopic dimensions (powder boundaries) of the sample, which will lead to uneven material properties.
These factors limit the industrial mass production application of high-entropy alloys prepared by spark plasma sintering.

Method used

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  • In-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and preparation method thereof
  • In-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and preparation method thereof
  • In-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of TiO(C) particle reinforced CoCrFeNiMn high-entropy alloy

[0029] Put Co, Cr, Fe, Ni, Mn, FeTi powder and 0.5wt% stearic acid into a planetary ball mill, first ball mill at 200rpm for 6 hours, and then at 400rpm for 66 hours. After ball milling, under an inert gas protective atmosphere, take an appropriate amount of ball-milled powder and put it into the first mold, and press it into a prefabricated block with a hydraulic press. The pressure of the hydraulic press is 1150 MPa, and the holding time is 5 minutes. Further, the prefabricated block was placed in a stainless steel sheath, and transferred to an induction heating coil for induction heating, with a heating temperature of 1150°C and a holding time of 2 minutes. Subsequently, put the heated prefabricated block into the second mold, and use a hydraulic press for hot extrusion. The preheating temperature of the second mold during extrusion is 450°C, and the extrusion ratio is 9:1. The cros...

Embodiment 2

[0031] Embodiment two: (Cr, Mn) 3 o 4 Preparation of CoCrFeNiMn High Entropy Alloy Strengthened by +NbC Particles

[0032] Put Co, Cr, Fe, Ni, Mn, Nb powders and 0.5wt% stearic acid into a planetary ball mill, first ball mill at 200rpm for 6 hours, then at 400rpm for 66 hours. After ball milling, under an inert gas protective atmosphere, take an appropriate amount of ball-milled powder and put it into the first mold, and press it into a prefabricated block with a hydraulic press. The pressure of the hydraulic press is 1150 MPa, and the holding time is 5 minutes. Further, the prefabricated block was placed in a stainless steel sheath, and transferred to an induction heating coil for induction heating, with a heating temperature of 1150°C and a holding time of 2 minutes. Subsequently, put the heated prefabricated block into the second mold, and use a hydraulic press for hot extrusion. The preheating temperature of the second mold during extrusion is 450°C, and the extrusion ra...

Embodiment 3

[0034] Example 3: Preparation of CoCrFeNiMn high-entropy alloy strengthened by TiO(C) particles

[0035]Put Co, Cr, Fe, Ni, Mn, FeTi powder and 0.5wt% stearic acid into a planetary ball mill, first ball mill at 200rpm for 6 hours, and then at 400rpm for 66 hours. After ball milling, under an inert gas protective atmosphere, take an appropriate amount of ball-milled powder and put it into the first mold, and press it into a prefabricated block with a hydraulic press. The pressure of the hydraulic press is 1150 MPa, and the holding time is 5 minutes. Further, the prefabricated block was placed in a stainless steel sheath, and transferred to an induction heating coil for induction heating, the heating temperature was 1050°C, and the holding time was 5 minutes. Subsequently, put the heated prefabricated block into the second mold, and use a hydraulic press for hot extrusion. The preheating temperature of the second mold during extrusion is 450°C, and the extrusion ratio is 9:1. T...

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Abstract

The invention provides an in-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and a preparation method thereof. Fine grain enhancement and particle enhancement are combined for theCoCrFeNiMn high-entropy alloy are the same time, the strength of the material is effectively improved through the synergistic effect of fine grain enhancement and particle enhancement, and the yieldstrength of the CoCrFeNiMn high-entropy alloy is remarkably higher than that of ordinary CoCrFeNiMn alloys. High-energy ball milling and the hot extrusion process are combined in the preparation method of the CoCrFeNiMn high-entropy alloy, and by means of the high-energy ball milling method, alloying of elements is achieved, volatilization and segregation of the elements in the smelting and casting process are avoided, and grains are refined; and due to the adoption of the hot extrusion process, rapid powder consolidation is achieved, nanoparticles are synthesized in situ, the CoCrFeNiMn high-entropy alloy with the nanoparticles and the fine grain structure is prepared, and the material strength of the CoCrFeNiMn high-entropy alloy is effectively improved. Furthermore, existing industrialized equipment for producing ODS high-temperature alloys can be directly adopted for the method, cost is low, sizes are not limited, and the in-situ synthesized nanoparticle enhanced CoCrFeNiMn high-entropy alloy and the preparation method are suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a CoCrFeNiMn high-entropy alloy reinforced by in-situ self-generated nanoparticles and a preparation method thereof. Background technique [0002] In recent years, high-entropy alloys have attracted great attention in the field of new metal materials due to their unique alloy design ideas and organizational structures. Its multi-element alloy design idea greatly increases the types of metal materials and provides a new idea for the development of new alloys. At the same time, its thermodynamic high-entropy effect, kinetic hysteresis diffusion effect, microstructure lattice distortion effect and performance cocktail effect make high-entropy alloys have many characteristics that traditional alloys do not have. [0003] So far, researchers at home and abroad have developed many systems of high-entropy alloys. Among the existing high-entropy alloys, the CoCrFeNi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C32/00C22C1/05B22F9/04B22F3/20
CPCB22F3/20B22F9/04B22F2003/208B22F2009/043C22C1/058C22C30/00C22C32/0005C22C32/0089
Inventor 梁加淼谢跃煌张德良
Owner SHANGHAI JIAO TONG UNIV
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